| 铕在硼磷酸钡玻璃中的空气下还原及其发光性质 |
| Reduction of Eu3+ in Air and Luminescence Properties of Eu2+ Activated Baric Borophosphate Glasses |
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| 摘要: 通过高温熔融法在空气条件下制备了Eu2O3掺杂的BaO-B2O3-P2O5玻璃,发射光谱中400～550nm的宽峰为Eu2+的5d→4f跃迁,即在非还原气氛条件下实现了Eu3+→Eu2+的转变.首先,Eu3+离子不等价取代玻璃基质中的Ba2+导致Eu2+的产生.同时,固体核磁共振谱数据表明当玻璃中的B主要以[BO4]的形式存在时,利于玻璃中的Eu以Eu2+价态存在.与ZnO-B2O3-P2O5:Eu2+玻璃中Eu2+的发光相比,BaO-B2O3-P2O5玻璃中O2-所形成的Eu的配位场强于ZnO-B2O3-P2O5玻璃中O2-所形成的Eu配位场.Eu在BaO-B2O3-P2O5玻璃中产生的晶体场分裂能大,故d→f跃迁产生的光发射波长较长. |
| 关键词: 硼磷酸钡玻璃 铕 还原 发光性质 |
| 基金项目: 河北理工大学博士基金(No.3024488)资助项目 |
| Abstract: A valence state change from Eu3+ to Eu2+ was observed in the europium ion-doped ZnO-B2O3-P2O5 glasses prepared at high temperature in air.The broad emission band ranging from 400 to 550 nm can be ascribed to the 5d→4f transition of Eu2+ ions.The 11B NMR measurements show that the rigid tetrahedral network structure of glasses plays an important role for the stability of Eu2+ in air at high temperature.A charge compensation model is proposed as a possible explanation where the negative vacancy of V"Ba acts as a donor of electrons to reduce Eu3+ to Eu2+.Compared with ZnO-B2O3-P2O5 glasses,the crystal filed intensity of Eu2+ in ZnO-B2O3-P2O5 glasses is stronger, the split energy of Eu2+ ions excited state is larger,which results in red shifting of Eu2+ emission band in ZnO-B2O3-P2O5 glasses. |
| Keywords: europium ion reduction luminescence ZnO-B2O3-P2O5 glasses |
| 投稿时间：2007-10-22 修订日期：2007-12-29 |
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| 廉志红,刘会欣,黎月英,沈毅.铕在硼磷酸钡玻璃中的空气下还原及其发光性质[J].无机化学学报,2008,24(3):398-402. |
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